How far apart are (-4, -6) and (-4, 13)

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.

I’m not good at math can i have ? ?

You use technology ans find a sum of 6.712e-8. write this sum in standard form